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Melanosmia) Pilicornis (Hymenoptera, Megachilidae, Osmiini

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Melanosmia) Pilicornis (Hymenoptera, Megachilidae, Osmiini Research Collection Journal Article Distribution, biology and habitat of the rare European osmiine bee species Osmia (Melanosmia) pilicornis (Hymenoptera, Megachilidae, Osmiini) Author(s): Prosi, Rainer; Wiesbauer, Heinz; Müller, Andreas Publication Date: 2016-10-28 Permanent Link: https://doi.org/10.3929/ethz-b-000122708 Originally published in: Journal of Hymenoptera Research 52, http://doi.org/10.3897/jhr.52.10441 Rights / License: Creative Commons Attribution 4.0 International This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH Library JHR 52: 1–36 (2016) Distribution, biology and habitat of Osmia pilicornis 1 doi: 10.3897/jhr.52.10441 RESEARCH ARTICLE http://jhr.pensoft.net Distribution, biology and habitat of the rare European osmiine bee species Osmia (Melanosmia) pilicornis (Hymenoptera, Megachilidae, Osmiini) Rainer Prosi1, Heinz Wiesbauer2, Andreas Müller3 1 Lerchenstrasse 81, 74564 Crailsheim, Germany 2 Kaunitzgasse 33/14, 1060 Wien, Austria 3 ETH Zurich, Institute of Agricultural Sciences, Biocommunication and Entomology, Schmelzbergstrasse 9/LFO, 8092 Zurich, Switzerland Corresponding author: Andreas Müller ([email protected]) Academic editor: J. Neff | Received 7 September 2016 | Accepted 19 October 2016 | Published 28 October 2016 http://zoobank.org/CDB9A942-AEC1-44C9-9272-EFFDA195CD57 Citation: Prosi R, Wiesbauer H, Müller A (2016) Distribution, biology and habitat of the rare European osmiine bee species Osmia (Melanosmia) pilicornis (Hymenoptera, Megachilidae, Osmiini). Journal of Hymenoptera Research 52: 1–36. doi: 10.3897/jhr.52.10441 Abstract Osmia pilicornis is distributed from western temperate Europe to western Siberia, where it exclusively occurs in open-structured, mesophilous and mainly deciduous woodland below 1000 m a.s.l. In Central Europe, its peak activity ranges from the last third of March to the first third of June. Due to its rarity and its low population densities over most of its range, the biology of O. pilicornis was only fragmentarily known. The discovery of six nests in the course of the present study revealed that females of O. pilicornis have a unique nesting behaviour among the osmiine bees: they gnaw their nests in dead wood with the aid of their strong mandibles, which have a peculiar chisel-like shape hypothesized to be an adaptation to the species’ specialized nesting behaviour. All six nests were in dead fallen branches of different tree and shrub species and of varying wood hardness. The nesting branches had a diameter of 1.5–6.1 cm, lay on sun-exposed ground and were largely hidden under vegetation. The nests contained one to three linearly arranged brood cells. Both cell partitions and nest plug were built from chewed leaves harvested from Fragaria vesca. Osmia pilicornis was identified as a new host of the chrysidid waspChrysura hirsuta, and the ichneumonid wasp Hoplocryptus confector developed in its nests. Microscopical analysis of scopal pollen loads of collected females revealed that pollen is mainly collected from three plant taxa, i.e. Pulmo- naria (Boraginaceae), Fabaceae (e.g. Lathyrus, Vicia) and Lamiaceae (e.g. Ajuga, Glechoma). On flowers Copyright Rainer Prosi et al. This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. 2 Rainer Prosi et al. / Journal of Hymenoptera Research 52: 1–36 (2016) of Pulmonaria, which is the most important pollen host over most of the species’ range, the females use specialized bristles on their proboscis to brush pollen out of the narrow corolla tube, they almost exclu- sively exploit pollen-rich flowers in the early red stage and they often steal pollen from still closed flowers by forcefully opening buds. On their search for females, males of O. pilicornis patrol flowers of Pulmonaria in a rapid flight regularly interrupted by short resting periods on the ground. Females are grasped for copulation both during flower visits and in flight between the flowers. The wide spectrum of semi-open mesophilous woodland types colonized by O. pilicornis suggests that dead fallen branches and a rich spring flora in combination with a rather warm but not xeric microclimate are the only requisites needed by the species. As the great majority of woodland habitats currently occupied by O. pilicornis in Central Europe owe their origin to human forest use, the recent decline of O. pilicornis in many regions of Europe may have been caused by changes in woodland management practices leading to closed and dark forests not suitable as habitats for this specialized bee species. Keywords Apiformes, Chrysura hirsuta, dead wood, Hoplocryptus confector, Pulmonaria, nesting behaviour, open- structured woodland Introduction Osmia pilicornis Smith is a member of the large holarctic subgenus Melanosmia repre- sented by 12 species in Europe (Müller 2016). Most of the European Melanosmia spe- cies are adapted to colder climates and typically occur in mountainous habitats, often exhibiting an alpine, boreoalpine or boreal distribution (Tkalců 1983, Rightmyer et al. 2010, Müller 2016). Osmia pilicornis, whose distribution area ranges from western over central and eastern temperate Europe to western Siberia, belongs to those few European Melanosmia species, which are restricted to lower elevations. Its early appear- ance in spring and its exclusive occurrence in mainly mesophilous woodland habitats, however, suggests a moderate preference for colder climates revealing its affiliation to Melanosmia. Osmia pilicornis is regarded as a rare bee species over most of its range (Westrich 1989, Amiet et al. 2004, Westrich et al. 2008, Falk and Lewington 2015). In several European countries, it is listed on regional or national red lists since its populations have declined in many regions in recent decades (Amiet 1994, Winter 1994, Dathe and Saure 2000, Saure 2005, Westrich et al. 2000, 2008, Van der Smissen 2001, Theunert 2002, Mandery et al. 2003, Burger et al. 2004, Burger 2005, Straka 2005, Tischendorf et al. 2009, Esser et al. 2010, Earwaker 2012). Changes in woodland management practices are assumed to be a major cause of its decline, resulting in a lack of suitable food plants and nesting sites (Earwaker 2012, 2014). Given the threatened status of O. pilicornis in parts of its European range, knowledge of the species’ require- ments for nesting sites, host plants and habitat characteristics is needed to aid in its conservation. The preference of Osmia pilicornis for the flowers of Pulmonaria (Boraginaceae) as pollen hosts has been known for a long time (Stoeckhert 1933, Westrich 1989, Müller Distribution, biology and habitat of Osmia pilicornis 3 1995, Amiet et al. 2004, Ebmer 2010), as has the presence of specialized bristles on the female proboscis, which are used to brush pollen out of the narrow Pulmonaria corolla tubes (Müller 1995). In contrast, the nesting biology of O. pilicornis is virtually unknown. While masticated leaves (“leaf pulp”) have recently been identified as nest building mate- rial (Westrich 2010), the nesting sites are still enigmatic. Depending on the author, O. pilicornis was assumed to burrow in stony ground (Wallis 1886), to nest in empty snail shells (Friese 1911, Banaszak and Romasenko 2001), to gnaw burrows in dead wood (Wallis 1886, Perkins 1891), to nest in old tree stumps or branches lying on the ground (Blüthgen 1919, Stoeckhert 1933, Chambers 1949), to build brood cells under loose bark (Amiet et al. 2004) or to colonize preexisting insect borings in dead wood (Earwaker 2014, Falk and Lewington 2015). While the assumption that O. pilicornis nests in the ground or in snail shells appears to be unlikely and is probably due to misidentifications with similar species, all the other literature records clearly suggest dead wood as nesting substrate. However, as no nests in dead wood have ever been described in detail, the ques- tion remains open whether the females of O. pilicornis excavate their own burrows, build their brood cells under loose bark or nest in insect borings. In the present publication, we describe nesting site, nest architecture and nesting behaviour of Osmia pilicornis based on the recent discovery of several nests in Germany and Austria. In addition, we report on a hitherto unknown host-parasitoid relationship between O. pilicornis and a chrysidid wasp, investigate host-plant spectrum and flower- visiting behaviour based on both analysis of female pollen loads and field observations and describe the mating strategies of the males. Furthermore, we present a comprehen- sive distribution map and characterize phenology and habitat of O. pilicornis focussing on Central Europe. Methods To elucidate the distribution of Osmia pilicornis, we conducted a comprehensive lit- erature study, gathered unpublished records from European entomological collections and retrieved distributional data from several public databases. Numerous additional records were provided by bee researchers all over Europe. For details see Acknowledg- ments and Suppl. material 1, which contains a complete list of all distributional data. To evaluate the phenology of Osmia pilicornis in Central Europe, all records were considered that could be assigned to sex and an exact date. Central Europe is defined here as the area that comprises Austria, Czech Republic,
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